Difference in margin for near, next and far month short options

F&O
1

Why is there difference in margin for near, next and far month? I am not able to find any reference on NSE explanation on margin or on recent NSE circulars on the margin requirement changes.

This is from Zerodha margin calculator.
Exchange Contract Product Strike Qty Initial margin Exposure Total
NFO x NIFTY19JAN Options 11000 CE 75 S 47,330 34,696 82,026
NFO x NIFTY19FEB Options 11000 CE 75 S 56,036 34,693 90,729
NFO x NIFTY19MAR Options 11000 CE 75 S 62,395 34,692 97,086
Total 2,69,842

Thanks.

2

I am guessing low liquidity in far off options, so movements can be more wild, hence more margin.

Just a guess.